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Re: Garage door detail[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Garage door detail
- From: pfr(--nospam--at)pacbell.net
- Date: Tue, 03 Feb 1998 22:24:42 -0800
T wrote: > > Subject: Garage door detail > > >...1997 (many of you may also have gotten it). It is a garage door detail, > which consists of a GLB spanning the garage opening, supported by two very > narrow (16" min) walls, which are sheathed on two sides. The ply sheathing > is nailed to the GLB in a grid pattern. Tiedown straps are added between > the GLB and the walls, with HD's as the footing. > > >My initial thoughts on this are: > > >We could resolve the moment at the GLB/wall connection by distributing the > load to the nails in the grid pattern (this was a basic statics problem in > school). The nails would all be in shear. > > We could determine the uplift force by resolving the moment into a couple > (another basic statics problem). We could use standard Simpson products (or > equal) for the straps and holdowns. > > What we are doing is creating a wood moment frame. Is this wise?? If wood, > over time, shrinks, or takes on a permanent deflection, wouldn't the nails > lose their shear resistance capacities? > > Talk to me, people > > Kate O'Brien, P.E. > Simi Valley, CA > > Assuming that this detail is meant to be a portal frame! > > The main shrinkage will be across grain. The glulam and the plywood should > show little shrinkage. The amount of nail grip loss will therefore be > minimal. If that is considered a problem then allow for it in the treatment > factors Kt or Kst. > > I have a problem with the base detail. With such a short "wall" the moment > transfer to the foundation is going to be relatively high. The detail as > shown would not adequate for the moments possible. Alternatively the lower > connection should be detailed as a "pinned" condition. Also, serious > anchors may be needed into the foundation and the glulam connection > depending on the load accumulation at this joint. > > In order to reduce the load(s) to such a portal, consideration of the > supported floor to act as a diaphragm might work. > > Thor Tandy P.Eng > Victoria BC > I need help. If the moment connection is between the GLB and the "Wall", I considered that only a pin may exist at the base of this frame.
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